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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 23 — Aug. 10, 2007
  • pp: 5742–5754

Two-point time-series measurementsof hydroxyl concentration in a turbulent nonpremixed flame

Jiayao Zhang, Galen B. King, Normand M. Laurendeau, and Michael W. Renfro  »View Author Affiliations


Applied Optics, Vol. 46, Issue 23, pp. 5742-5754 (2007)
http://dx.doi.org/10.1364/AO.46.005742


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Abstract

Quantitative two-point hydroxyl time-series measurements have been performed in a turbulent nonpremixed flame by using two-point picosecond time-resolved laser-induced fluorescence. The current diagnostic system has been improved from its preliminary version to address optical aberrations and fluorescence lifetime fluctuations. In particular, with a newly designed collection system, the aberration-limited blur spot is reduced from 6   mm to 180   μm . Additional photon-counting channels enable the recovery of absolute OH concentrations through a triple-bin integration method. The present research represents what we believe to be the first application of this two-point technique to turbulent flames. Two independent schemes have been applied to remove uncorrelated noise in the derived two-point statistics. We show that optical aberrations can have a significant effect on space–time correlations. However, the sampling rate and fluctuations in the fluorescence lifetime barely affect the spatial autocorrelation function and thus the integral length scale. Such length scales for hydroxyl are found to rise linearly with increasing axial distance at peak [OH] locations. Along the jet centerline, the integral length scale varies slightly below the flame tip but increases rapidly above the flame tip. In addition, the OH length scale demonstrates the same trend as the OH time scale along the jet centerline, but the opposite trend at peak [OH] locations.

© 2007 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(220.4830) Optical design and fabrication : Systems design
(280.7060) Remote sensing and sensors : Turbulence
(300.2530) Spectroscopy : Fluorescence, laser-induced

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: December 1, 2006
Revised Manuscript: April 13, 2007
Manuscript Accepted: April 23, 2007
Published: August 8, 2007

Citation
Jiayao Zhang, Galen B. King, Normand M. Laurendeau, and Michael W. Renfro, "Two-point time-series measurements of hydroxyl concentration in a turbulent nonpremixed flame," Appl. Opt. 46, 5742-5754 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-23-5742


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